Chuck



oa; 19,1926, Leos 531 J. F. FLAHERTY CHUCK Original Filed Jly 12, 1920 @Hannut Patented Oct9 19, 1926. i y

Ultll'il) STATES iiifitE..

JOHN F. FLAHERTY, DECEASED, LAL-QE OF TOLEDO, OHIO; BY HAROLD J". KEHOE, EX- ECUTOR, OF TOLEDO, OHIO, I SSGNOR TO THE BOOK BEABING COMPANY, OF TO- LEDO, OHIO, A CORPORATON OF OHO.

CHUCK.

Original application iiled July 12, 1920, Serial 7, 1923.

This invention relates to chucks or work holders and the present application is a division of an earlier application No. 995,539, tiled July 12, 1920.

One of the objects of the invention is to provide a chuck for holding a piece of work accurately in position to be operated upon by a grinding wheel or other device used. as a cutting means, on a machine with which the work holder is associated.

A further object of the invention is to provide a work holder adapted to automatically eject the work after it has been operated upon.

A further object ci' the invention is t-o provide a chuck especially adapted tor use in a machine for grinding the heads of rollers for bearings.

One :form` of the invention is illustrated in the accompanying' drawings ot which Fig. 1 is a longitudinal section of the chuck and the parts ot a grinding machine on which it is mounted; Fig. 2 is a longitudinal section through the spindle and chuclr and showing the parts with the chuck open and ready to grip the article; and Fig. 3 is a transverse section on the line 3-3 of Fig 2.

Referring to Lathe drawing, 79 indicates a vertical shaft suitably supported and having arranged thereon Ytor swinging movement a bracket 82 on which a housing 83 is slidably mounted by means of the dovetail 84.

A hollow spindle 85 is mounted in bearings S6 and 87 in the housing 83 and has an extension 88 threaded into one end thereof. The opposite end of the spindle 85 .is enlarged, to provide a thrust shoulder 89 which bears against one end of the bearing 86 and cooperates with the thrust collar 90. which is held on the spindle by means oi the nuts 91 and 92 and which engages the end ot the bearing 87, to hold the spindle against axial movement in either direction. A dowel 93 connects the thrust collar 90 with the nut 91 so as to cause the thrust collar to rotate with the spindle.

The bearings S6 and S7 are adjustable Yfor wear so as to hold the spindle 85 against lateral movement. The same adjustment is used for both o'f the bearings 86 and 87 and,v

therefore, a description of one will be sut- No. 395,539. Divided and this application led September serial No. 661,356.

iicient. A flange on the bearing cooperates with the shoulder 9-t in the housing 83, to hold the bearing` against axial movement in one direction. rllhe bearing is split and in the split is provided a threaded opening for the tapered end of the screw plug 95, this screw plug positively holding the bearing against contraction, but, upon being backed out, will permit a certain amount of contraction, owing to the tapering ot the end ot the screw. The outer surface 'of the bearing` is tapered, as indicated at 9G, and has arranged thereon a sleeve 97 that is provided with a tapered bore and a cylindrical outer surface which iits the bore 9S ot the housing S8. The sleeve 97 has a slot 99 through which the screw plug 95 projects and also has one end threaded, as indicated at 100, to receive the nut 101 which bears against a Shoulder on the housing 83 and cooperates with the shoulder 94h to hold the bearing from axial movement in either direction. The bearing 86 has a threaded end 102 on which there is a nut 103 which bears against the end of the sleeve 97, to hold the latter against axial movement relative to the sleeve.

The construction just described enables thebearing 86 to be contracted on the spindle 85 to compensate for wear, and to malte this adjustment, the screw plug 95 is backed cui slightly and the nut 101 loosened. The nut 103 is then turned to force the sleeve 9T onto the bearing to contract the latter, the engagement of the flange on the bearing with the shoulder 04 holding the bearing against axial movement when this adjustment is made. lilhen the bearing has been contracted sufficiently, the nut 101 is again tightened and the parts will be retained in their adjusted position. lt will be understood that in making this adjustment, the screw plug 95 will be backed out only such an amount as will permit the required adjustment, so that when the adjustment is completed the screw plug will posi-I tively hold the split in the bearing 'with the desired amount ot opening.

A cap 104 is arranged over the exposed end of the screw plug 95 to prevent the latter 'from being turned accidentally and to prevent dirt from getting into the bearing.

Arranged within the spindle 85 and the CFI extension 88, but rotatable therewith, is an axially shiftable tubular member or sleeve 105, one end of which is enlarged to receive the head 106 which has a screw threaded connection therewith at 107. The head 106 has a conical bore 108 which cooperates with the conical exterior of the split collet 109, this collet being adapted to receive the work A therein and securely hold it by its gripping action thereon. The collet 109 has a threaded connection at 110 with a tubular member 111, and the latter has a threaded connection at 112 with the rod 113. The rod 113 has its outer end threaded, so as to be adjustable in the cap 114 at the outer end of the spindle extension 83. A lock nut 115 is adapted to secure the rod 113 in its adjusted position and a cap 116 is arranged over the end of the rod 113 and the nut 115. The member 105 has an extension 117 screwed on the end thereof, and at the outer end of this extension, there is a plug 118 through which the rod 113 slides. A plurality of coil springs 114: are arranged between the cap 114 and the -plug 113 and serve to move the sleeve 105 and head 106 so as to release the collet 109. A sleeve 119 is slidable axially within the extension 117 and this sleeve and the extension are provided with radial slots, to receive the wings 120, each ol which has a pivot 121 transversely arranged in the spindle extension 83. A collar 122 is Aarranged on the extension 88 and protects the pivots 121. An axially shilftable collar 123 is arranged on the exterior of the spindle extension S8 and has cam surfaces 124 which cooperate with the wings 120, to move the latter inwardly, the wings also engaging abutments 125 on the sleeve 119, to move the latter axially against the pressure of spring 126. The spring 126 is arranged within the sleeve 119 and bears against the internal flange at the end of the sleeve and against the plug 118.

A plunger 127 is slidably mounted in the member 111 and a spring 123, which bears on a tollar 129, on the plunger 127 and on the end of the rod 113, normally presses the plunger against the work A, and when the collet 109 is expanded and the work thereby released, the plunger 127 serves to eject the work from the collet.

A driving gear 130 for the spindle 85 is keyed to the latter and held in position thereon by the shoulder 131 and the nut 132.

In the operation of the chuck, the spindle 85 is rotated continuously by means of the gear 130y and when the work A is inserted in the collet 109, the plunger 127 is pushed inwardly against the pressure oi the spring 128 until the work reaches its proper position, when the collar 123 will be shii'ted to the position shown in the drawing, the inclined surfaces 124 drawing the wings 120 inward, and the wings, in turn, moving the sleeve 119 toward the right, and the latter, through the spring 126, drawing the .sleeve 105 and the head 106 toward the right, so as to contract the collet 109 on the work and securely hold the latter. lllhen the collar 123 is again shifted to the lelit, from the position shown in the drawing, the wings 120 will be allowed to swing outwardly and the springs 114 will move the sleeve 105 and head 100 to the lett to effect the release of the collet 109 so that the plunger 127 can eject the work from the collet.

A reciprocating plunger 175, actuated by any suitable mechanism is arranged in axial alignment with the chuck to force the arti` cle A into the chuck against the tension ol the spring 123, the movement of the plunger toward the chuck being definitely limited to accurately position the article longitudinally oli the chuck. The collar 123 is actuated in timed relation to the plunger 175 to grip the article as soon as it is positioned by the plunger.

Having thus described the invention, what I claim is:

ln apparatus of the class described, the combination ot a tubular member having a split collet on one end and a rod on the other end, a hollow spindle having an end wall in which said rod is adj ustablj secured, said collet having a conical exterior, a longitudinally slidable sleeve within said spindle and supporting said tubular member and having an end wall through which said rod extends, said sleeve having a conical inner surface cooperating with the conical exterior surface or' said collet to contract the collet on the article to be held therein, a sleeve slidable within the first-mentioned sleeve, an actuating lever for moving the secondmentioned sleeve relatively to the first-mentioned sleeve, a spring surrounding said rod and cooperating with said sleeves to elect relative movements thereof in opposition to the movements etlected by said lever, spring means between said end walls ior moving the first-mentioned sleeve in the direction which releases said collet, means for actuating said lever, and a spring actuated plunger within said member for ejeftingthe article from said collet. l

In testimony whereof I aiiix my signature.

HAROLD J. KEI-10E. Exacta/im of the Estate 0f Jom F. Flaherty,

Deceased.

llO 

